Door-check.



W. B. SMITH. DOOR CHECK.

APPLIGATION FILED JAN. 31 1914.

1,127,68 Patented Feb. 9, 1915.

2 SHEETS-SHEET 1.

' Zmf/ vl W. B. SMITH.

DOOR CHECK.

APPLIUATION IILBD'JANmBl 1914. Lm. ,Patented F@b.9,1915.

2 SHEETS-SHEET 2.

UNITED sTATEs PATENT oFEIcE. 7

WILLIAM IB. SMITH, 0F DANVILLE, ILLINOIS.

:DOOR-CHECK.

T0 all whom it may concern.'

Be it known that I, WILLIAM B. SMrrH, a citizen of the United States, and resident of Danville, in the county of Vermilion and State of Illinois, have invented certain new and useful Improvements in Door-Checks, of which the following is a speciiication.

My invention relates to door checks or closers and has particular reference to a novel liquid check arranged for swing doors.

In door checks heretofore suggested, much difficulty has been experienced in providing for rigidity, freedom from leakage and ease in opening, with the requisite restraining effect in closing. In liquid checks employing pistons, it is diiiicult to secure absolute freedom from leakage without employing glands secured so tightly that freedom of operation is interfered with.

An object of my invention therefore, is the construction of a liquid door check which is adapted for use without the employment of stem packing, with the result that the operation is unrestrained. by friction. This is accomplished by providing a valved chamber above the liquid containing` chamber and through which the operating stem projects. connecting the liquid chamber with the overflow or'escape chamber, no liquid is allowed to escape into the over-flow chamber through the valve but any which may escape around the stem is .retained in the upper chamber until the pressure is reduced in the liquid chamber, whereupon the liquid trapped in the upper chamber will return by gravityto the liquid chamber through the check valve.

A. further object is Athe provision of a door check so constructed as to be applicable either to double or single acting right or left hand doors; which shall have the smallestI possible number of moving parts; which shall permit the ready openingof the door and a graduated closing. v

These objects are secured in my check, in which is included a container provided with an oscillatory piston.

By my improvement a door check and closer may be formed of exceedingly few parts, none of which are liable to become out of order, which may be constructed rigidly, may be readily adjusted `as required and which may be manufactured economically.

7Ille invention will be more readily understood by reference to the accompanying drawings, wherein,

Because of .the check valve.

` Specication of Letters Patent. Patented Feb. 9, 1915.

Applcation led January 31,A 1914. Serial No. 815,613. l I

Figure 1 -is a plan view of a door check and closer constructed in accordance with my invention; Fig. 2 is a longitudinal sectional view on the line x2-2 of Fig. 1; Fig. 3 1s a transverse vertical section on the line 3-3 of Fig 1; Fig. 4 is a section on the line 4-4 of Fig., 3; Fig. 5 is an enlarged perspective of the stem and wing piston secured thereto, and, Fig. 6 is a vertical section on the line 6 6 of Fig. 4.

Referring more particularly t the drawings it will be seen that I provide a casing member havingadepending annular flange y 10, threaded at its lower end, to which may be secured a bottom cap 11, having a hollow boss 12 therein, for the 'accommodation of the central shaft 13. The casing member is provided also with a lateral extension 14, in the form of a' basin, this basin acting to con` tain suitable springs and also to act as a container for overii'ow vor surplus liquid. yT his lateral member is suitably flanged to pro` vide for the attachment of a top cover plate 15, by means of which the chamber is tightly closed. Suitably secured to the interior of the annular flange 10, is a metal plate 16, this plate acting as a wall, partially dividing the chamber into two compartments. This plate is rigidly secured to the casing memberv by means of screws 17. A regulatingscrew 18, is projected downwardly through the top wall and is provided with a transverse aperture 19 therein, the screwacting as a regulating device whereby the escape of liquid from one compartment to the other is controlled. As best shown in Fig. 4, the wall 16 closely abuts the central shaft 13, makinga com paratively tight connection therebetween.

Secured to the shaft 13 is the wing piston 20, the outer edge of which closely fits the interior of the chamber containing the controlling liquid. By the addition of this wing piston the chamber is divided into two compartments normally of equal capacity. As beast shown in Figs. 5 and 6, the wing 20 isapertured transversely and radially, the transverse apertures accommodatingv ball containers 21, 22, which devices act as check valves. The radial recess 23, is closed by the adjoining wall of the container when the wing is in normal position as shown in Fig. 4l. However, as the wing piston is swung to los right or left, the recess 23 registers with an eccentric groove 24, thus providingfor the entrance of liquid into the recess and the; escape of the liquid througlione of the check let valves 21, 22. Thus it will be seen that assuming the container to be full of liquid, a movement of the wing piston in a clockwise direction will tend to compress the liquid within the upper half ofthe chamber as viewed in Fig. 4, this liquid being unable to escape through the check valve 21. How` ever, as the wing piston is moved, the recess 23 is broughtinto register with the eccentric groove24, and liquid is allowed to escape through the groove and recess and out the check valve 22, into the opposite side of the chamber. .As the movement of the piston continues the liquid is transferred from one chamber to the other until the limit of movement is reached. On the return of the piston to normal position the escape aperture is at once closed ofl2 due to the fact that pressure is transferred from theupper 'to the lower chamber whereby the check valve 22 prevents the return of the liquid, except such as.

may escape around the face of the piston. lThe return of the wing to normal position is therefore controlled by the escape of liquidthrough the aperture 19, shown in Fig. 2f. This construction provides an eX- tremely eicient device and in practice it has been found that the return of the piston to normal position may be accomplished very quickly but with uniform motion throughout its return of travel. Of course, the action when the piston is moved in a counter-clockwise direction is the opposite of that just described.

It will be understood that under extreme pressure* some liquid may escape, upward around the shaft or stem 13. Any such liquid will be retained in the upper portion ofthe casing member it being intended that this portion of the devicevshall act as a reserve supply chamber. It is, however, desirable that any such liquid should be returned to the lcontrol chamber as soon as the parts return to their normal position. I have therefore provided in the dividing wall between the two' 'chambers a check valve 25 as best shown in Fig.l 3, this valveA being moved against its seat whenever there is pressure in the control chamber,A thus preventing the. escape of any liquid from ythe control chamber into the expansion chamber- .As stated, the springs' for closing the door are also contained in the upperl chamber. lThese springs act upon ,the stem through a pair of;- oppositely disposed arms 21.6 27, suitably secured to the. stem by means of., a Set bolt 28, Jand carryingantifriction roll- -ers 29, these rollers cotiperating with a reciprocatory yoke 3.0, the legs of which-are fitted; against the walls of the lateral. extensnnlft, .l patri ofrhelicali springs 31, bear ageinstqtheyoke 3.0, tending to force the saine tovgard thestem.- nTo prevent possible dispacement. ofthe 'yoke member-'30, 1erethe siem. nun-m.- eutwerdlv proiectsaxg flange 32, which flange enters a slot in the levers 26, 27 and a notch 33, in the stem 13.

- Thus the springs and the yoke are maintained in position without reliance on the cover plate 15. Obviously by the employment of the yoke member described, a parallel axial motion of the springs is assured thus avoidingany torsional strains therein. Obviously also, the partsmay be readily dismantled by the removal of theset bolt 28, and the slight compressioniof the springs =ton mounted within said chamber and valves within said piston, the width lof said concentric, surface being substantially the same as the width of said piston at the point of coincidence, substantially as described.

2. ln a door check having a container for a liquid to afford a checking medium, an oscillating piston having a port therethrough, and means for covering one end of said port, saidmeans being graduated so as to fully close, said port in onepp'osition and to gradually uncover the same as the piston i moves from, said position, and a valve for controlling the opposite end of the port, substantially as described.

3. In a device of the class described, the combination of a container having a transverse interior wall, a wing piston rotatably mounted within said container, the inner face of.v said container bein provided with an eccentric groove, said groovel cooperating with said wing,` and valves carried by said wing, substantially as described.

. 4, ln a device ofthe class described, the combination of a container having a transvcrse'inner wall, a wing mounted for oscil.- lation within said container, said wing being provided with a recess having a port controlled by a valve, and an eccentric portion on the interior of said container, said portion ccveratine with the recess-n Said vvijng whereby the passage efliuid through and' around said wing is telltrclled, Substantially as described,

' 5. Ina device of the classidescribed, the combination lof' a container-having iinperforate .bottom and. side Walls e piston mounted within said container, a @Insure for Said Container, :Said closure being provided with an overfcw. Chamber, eed-.With a.'

valved Opening.' @Qmmlllllllg with, Sid container'whereby fluid; within said upper stantially Tas,- described.

s 6., la a check and closerinr double-acting Y chamber may return to saidccntaner;

doors, the'combinaton oialqllif 137 a stem carrying a wing mounted for oscillation in the container, oppositely arranged check valves in said wing, said container having an eccentric portion arranged to cooperate with said wing whereby the passage of liquid around and through said Wing is controlled, substantially as described.

7. In a door check, a container provided with an eccentric wall, a wing piston rotatably mounted in said container, said wing being provided with a radial recess, valved ports communicating with said recess, one end of said recess being adapted to be closed by said eccentric wall inone position of said wing and `to be gradually opened by the movement of said wing relatlve to said eccentric wall, substantially as described. v

8. In a device of the class described, the combination vof a container having a transverse inner wall, a wing piston mounted for oscillation within said container, said piston having a valved port, and a concentric portion on the wall of said container at the point of rest of said piston and adapted to coperate with said piston to interrupt the passage of fluid through and around said 4 piston in one direction of movement of the piston, said valved p ort permitting the passage o liquid another direction of movement` of the piston, substantially as described.

9. In a check for swing doors, the combination of a casing providing upper and lower chambers, a piston mounted in said lower chamber, the piston stem projecting upwardly through the walls separating said two chambers, anda check valve connecting said upper and lower chamber, said valve being adapted to be seated upwardly and to permit the passage of liquid from said upper chamber into said lower chamber in the absence'of pressure in said lower chamber, substantially as described. L l0. In a4 check for swing doors, the combinaticn of a casing providing upper and lower chambers, a piston mounted in said. lower chamber, springs mounted.v in said upper chamber and acting with said piston to control a swing door, and a check valve connecting said upper and lower chambers, said valve being adapted to permit the passage of liquid from said upper chamber to said lower chamber, substantially as described.

WILLIAM B. SMTH.

Witnesses:

CHARLES C. LINTHICUM, T. Bum. 

